Orange square with a white minus = someone we hate .. you CANNOT shoot him in high sec Red square with a white minus = someone we hate A LOT!! .. you CANNOT shoot him in high sec Red square with a white skull = someone that is an outlaw.... you CAN shoot him ... IF you can take him on. Red square with a white star = someone that is a wartarget to you.... you CAN shoot him ... IF you can take him on. Light or dark Blue square with a white plus = someone we're friendly with .. DONT shoot them Dark square with a white star = someone in your alliance.
You need high scan strength for scanning for ships. You need low scan deviation for scanning static objects.